On understanding the applicability of Mohr-Coulomb failure hypothesis for composite materials using UnitCells©Tools Balasubramani, Nimal Kumar, Sitnikova, Elena and Li, Shuguang (2016) On understanding the applicability of Mohr-Coulomb failure hypothesis for composite materials using UnitCells©. In: 5th Aircraft Structural Design Conference, 4-6 October 2016, Manchester, UK. Full text not available from this repository.AbstractThe applicability of Mohr-Coulomb (M-C) failure hypothesis for anisotropic composite materials is re-examined in this paper. Mohr-Coulomb failure theory has been widely referred to in the literature to study the failure of unidirectional (UD) fibre reinforced composites under transverse loading including the renowned Puck’s criteria. This has been partially validated based on the experimental correlations with the predictions made by the M-C criterion for a few set of test cases, which remains a debatable way of formulating composites failure criterion. It is brought to attention that Mohr utilised the concept of principal stresses in constructing principal circles and assumed that the outermost circle represents the critical state of failure. This hypothesis and its derivative “failure is dictated by the stresses acting on the fracture surface” have thus been used for formulating the criterion for isotropic materials that exhibit brittle fracture characteristics. However, the concept of principal stresses is not employable in the analysis of composites. Hence, the same hypothesis may not be applicable in studying composite materials. Also, the micromechanical aspects that lead to failure have not been taken into consideration in this hypothesis which can lead to incorrect predictions in the case of composite materials.
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